Avoid converting label ids twice by label map during evaluation

[panfeng-hover]

seg_map or gt_seg_maps are already converted by the label_map during self.get_gt_seg_map_by_idx or self.get_gt_seg_maps, pass the self.label_map to intersect_and_union or eval_metrics will do the conversion again.

#1415

[CLAassistant]

All committers have signed the CLA.

[MengzhangLI]

Hi, thanks for your contribution. Plesae fix the lint error!

[codecov]

Codecov Report

Merging #1417 (d1ebb3d) into master (98984bf) will decrease coverage by 0.09%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #1417      +/-   ##
==========================================
- Coverage   90.39%   90.30%   -0.10%     
==========================================
  Files         133      139       +6     
  Lines        7906     8304     +398     
  Branches     1318     1395      +77     
==========================================
+ Hits         7147     7499     +352     
- Misses        536      567      +31     
- Partials      223      238      +15     

Flag	Coverage Δ
unittests	90.30% <75.00%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmseg/datasets/custom.py	94.73% <75.00%> (+0.05%)	⬆️
mmseg/datasets/hrf.py	77.77% <0.00%> (-2.23%)	⬇️
mmseg/datasets/drive.py	77.77% <0.00%> (-2.23%)	⬇️
mmseg/datasets/chase_db1.py	77.77% <0.00%> (-2.23%)	⬇️
mmseg/datasets/pascal_context.py	75.00% <0.00%> (-1.48%)	⬇️
mmseg/core/evaluation/metrics.py	93.61% <0.00%> (-1.07%)	⬇️
mmseg/apis/train.py	20.51% <0.00%> (-0.83%)	⬇️
mmseg/models/backbones/mit.py	86.98% <0.00%> (-0.70%)	⬇️
mmseg/datasets/isaid.py	93.93% <0.00%> (-0.18%)	⬇️
mmseg/core/__init__.py	100.00% <0.00%> (ø)
... and 15 more

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[panfeng-hover]

Failed due to

yapf.....................................................................Failed
- hook id: yapf
- files were modified by this hook
- 

I saw a similar error here, pre-commit/pre-commit#747, but not sure how to fix it

[MengzhangLI]

Failed due to

yapf.....................................................................Failed
- hook id: yapf
- files were modified by this hook
- 

I saw a similar error here, pre-commit/pre-commit#747, but not sure how to fix it

Its ok. Try more times git add . + pre-commit run --all-files. Then it would be modified automatically.

[panfeng-hover]

The new commit is added by git add . + pre-commit run --all-files, would u like to re-run the test? @MengzhangLI

[panfeng-hover]

Not sure about the codecov/patch and codecov/project fails, need to merge master?

[OpenMMLab-Assistant003]

Hi @panfeng-hover！First of all, we want to express our gratitude for your significant PR in the MMSegmentation project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.

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Thank you again for your contribution❤ @panfeng-hover